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Inventories, net - Inventories (Detail) - USD ($)
$ in Thousands
Dec. 31, 2021
Dec. 31, 2020
Inventories, net [Line Items]    
Total raw materials $ 5,042 $ 3,220
Total work-in-process 16,767 11,668
Total finished goods 3,833 3,449
Total inventories, net 25,642 18,337
Security Products    
Inventories, net [Line Items]    
Total raw materials 3,640 2,318
Total work-in-process 12,721 9,214
Total finished goods 2,271 2,235
Marine Components    
Inventories, net [Line Items]    
Total raw materials 1,402 902
Total work-in-process 4,046 2,454
Total finished goods $ 1,562 $ 1,214